Spring 2001 Exam III - POLYMER PHYSICS Spring 2001 EXAM III EMA 6165 NAME STUDENT HONOR CODE We the members of the University of Florida community

POLYMER PHYSICS Spring 2001 EXAM III NAME:___________________________ EMA 6165 STUDENT #:______________________ HONOR CODE : We, the members of the University of Florida community, pledge to hold ourselves and our peers to the highest standards of honesty and integrity * . Signature _____________________________________________________ Part I: Polymer Structure and Properties 1. Give the appropriate value for each critical temperature that would be required for injection molding the resin. Mark any space as NA if it is not applicable. Give a value for Tg or Tm whichever is appropriate. (10 pts) Polymer Tg Tm Poly(ethylene) Poly(styrene) Poly(ethylene terephthalate) Poly(phenylene ether imide) (Ultem) Poly(dimethylsiloxane) Poly(hexamethylene adipamide) (Nylon 6,6) Poly(vinyl chloride) Poly(propylene) Poly(methyl methacrylate) Poly(bisphenol A carbonate)

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POLYMER PHYSICS - Spring 2001 EMA 6165 - EXAM III Part II: Indicate whether the following statements are TRUE or FALSE . Give an explanation if the statement is false. (10 pts) 1. Branching decreases the fusion temperature of polyethylene. 2. Spinodal phase separation processes are characterized by instantaneous precipitation with small fluctuations in the electron density initially. 3. The Doolittle equation predicts the molecular retardation rate of chains adsorbing onto the face of a growing crystal. 4. The surface energy of a crystal increases linearly with the fold surface energy 5. The elastic stress scales with the functionality of cross link junctions to the second power under uniaxial elongation.